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W. S. BROWN.

CRANK SHAFT FOR VBLOCIPEDES. No. 596,846. Patented Jan. 4, 1898.

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YVILLIS S. BROXVN, OF BELVIDERE, ILLINOIS, ASSIGNOR TO THE NATIONAL SEWING MACHINE COMPANY, OF SAME PLACE.

GRAN K-S HAFT FO R VELOCiPEDES.

SPECIFICATION forming part of Letters Patent No. 596,846, dated January 4, 1898.

Application filed August 12,1896. Serial No. 602,506. enamel.)

To all whom it may concern: the hollow section 7. The threaded portion Be it known that I, W'ILLIS S. BROWN, a might obviously extend throughout the citizen of the United States, residing at Bel length of the interior of the hollow section 7; videre, in the county of Boone and State of but it is preferable to form a plain portion 11 5 Illinois, have invented certain new and useon the end of theinternal section, which abuts ful Improvements in Crank-Shafts for Velociagainst the end of the socket formed in the pedes, of which the following is a full, clear, hollow section, and thus limits the relative and exact specification. rotation of the two sections of the shaft when My invention relates to cranks and crankbeing screwed together. After theparts have 1o shafts for use on velocipedes or bicycles, and been screwed together in this manner they more especially to that type in which each of may be held against retrograde movement by the cranks is formed integrally with a part of any suitable ineanssuch, for instance, as a the crank-shaft, which consists of a number cotter 12, which passes through both sections of sections detachably secured together. of the shaft and has a threaded end screwing 15 The object of my invention is to provide into the side of the hollow section, as clearly an improved and simple construction of comshown in the drawings, thus avoiding the posbined shaft and cranks in which the shaft sibility of the parts unscrewing when backshall consist of but two simple parts, each pedaling. having one of the cranks formed integrally The barrel of the crank-hanger may be pro- 2o therewith. vided with a suitable opening closed by it Another object of my invention is to form screw-cap 12 for the insertion of the cotter both of the crankshaft cones integrally with 12 after the parts have been screwed together one section of the two-part shaft. within the crank-hanger; or, if desired, the

\Vith these ends in View my invention 0011- parts may be so proportioned that the cranks 7 5 25 sists in certain features'of novelty in the conand crank-shaft may he slipped through the struction, combination, and arrangement of crank-hanger after they are screwed together parts by which the said objects and certain and the cotter inserted. other objects hereinafter appearing are at- One end of the internal section of the cranktained, all as fully explained with reference shaft, near the crank 6, is provided with an 30 to the accompanying drawings, and particuenlarged shoulder, on which is formed a series larly pointed out in the claim. of teeth or corrugations 13, which engage with In the said drawings, Figure 1 is a plan seccomplementary corrugations formed in the tion of a crank-hanger and myiinproved comhub of the sprocket-wheel 14-, thus constitutbined shaft and cranks. Fig. 2 is a transing means for securely holding the sprocket 35 verse sectional view taken on the line 2 2, against independent rotation on the crank- Fig. 1. shaft.

1 represents the barrel of the crank-hanger, The hollow section 7 of the crank-shaft is whose ends are screw-threaded internally and of sufficient length to project from one set of provided with the adjustable cups 2 3, respecballs to the other, and upon the periphery of 4o tively, in which the races for the balls are this hollow section are formed both cones 15 formed, the balls being held in place'in such 16, upon which the balls run, the cones beraces by means of retaining-rings 4, forced ing hardened to the proper degree, while the into the inner ends of the cups 2 8. remaining portions of the hollow section '7 56represent the cranks, the former of which and the crank 5 are allowed to retain the 45 is formed integrally with one section 7 of requisite degree of elasticityand malleability.

the crank-shaft, which section is hollow and The outer end of the hollow section 7 is surscrew-threaded interiorly between the points rounded by the cup 3, and such outer end is 8 9. The other crank (i is formed integrally provided with a groove containinga packingwith the other section of the crank-shaft, ring 17, which is locatedat the intersection of I00 50 which is provided with a screw-threaded porthe cup 3 and the section 7, so as to arrest tion 10, screwing into the internal threads of the passage of any foreign matter that might find its way between the cup and shaft. The other end of the section '7 is overlapped by a flange 2 of the cup 2, but does not pass through such cup 2, while the cup 2 is provided with alaterally-projecting flange 2 which overlaps the hubof the sprocket-wheel 14, and which, in conjunction with such hub, constitutes the housing for a packing-ring 18, which surroundsthe internal section of the crank-shaft and prevents the passage of grit to the bearin gs at this end of the crank-hanger.

With a device thus constructed it will be seen that the entire crank-shaft and pair of cranks are composed of but two simple parts, 7

I claim as new, and desire to secure by Letters Patent, is-

The combination with a crank-hanger having the cups 2 3 secured therein and provided with antifriction-balls, of a crank having a hollow section of crank-shaft formed integrally therewith and provided on its exterior with a pair of cones, said hollow section passing through said cup 3 and terminating within said cup 2 and the cup 2 being provided with the flange 2 overlapping the end of said hollow section of crank-shaft, a second crank having another section formed integrally therewith and projecting through said flange 2 and being removably secured in said hollow section of shaft, the sprocket-wheel secured on said second section of shaft between said flange 2" andv said second crank, the

flange 2 surrounding the hub of said sprocket and the packing-ring 18 located between the flange 2 and the hub of said sprocket, substantially as set forth.

W'ILLIS S. BROVN. \Vitnesses:

CHARLES H. PIERCE, F. D. E. BABCOCK. 

